After urea is applied, it is not suitable to immediately water the urea to be applied to the soil, and it will soon be converted into ammonium amide, which is easy to lose with water. Therefore, it should not be watered immediately after application, and should not be applied before heavy rain. Urea can be applied as a top dressing, which can effectively prevent premature aging of plants due to nitrogen deficiency in the middle and late stages of crops, but care should be taken to avoid fat burning. Urea should also be avoided as a seed fertilizer.
Ammonium sulfate avoids long-term use of ammonium sulfate is a physiological acid fertilizer. If applied in the field for a long time, it will increase soil acidity, destroy soil aggregate structure, and make soil compaction and reduce physical and chemical properties, which is not conducive to fertility.
Nitrate Nitrogen Fertilizers should not be denitrified and lose nitrogen after applying nitrate, such as ammonium nitrate or sodium nitrate, to paddy fields and vegetable fields. When the nitrate nitrogen fertilizer is applied to the vegetable field, the nitrate content of the vegetable will be multiplied, and it can be reduced to nitrite in the human body, which is extremely harmful to the human body.
The chlorinated fertilizer should not be applied to the saline-alkali soil and the chlorine-free crops. The ammonium chloride, potassium chloride and other chlorinated fertilizers are applied to the soil for decomposition, which will lead to acidification of the soil. When used on saline-alkali soil, the salt damage will be aggravated. The application of chlorinated fertilizers to bogey chlorine crops such as potatoes, watermelons, grapes, etc., can reduce the starch and sugar content of the products, affecting the yield and quality of the products.
Phosphate fertilizer should not be dispersed. Because the activity of phosphate fertilizer is small, it is difficult to be absorbed by crops. Therefore, when applying the phosphate fertilizer, it should be applied as a base fertilizer, and concentrated in the seeding ditch or the nest, preferably mixed with the organic slag fertilizer for a period of time and then applied.
Potassium fertilizer should not be applied to the late part of the crop due to the potassium in the lower stems and leaves of the crop, which can be transferred to the top part for reuse. Therefore, potassium fertilizer should be applied in advance at the seedling stage or into the early stage of reproductive growth, or applied as a base fertilizer at one time.
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